<form name="login" id="login" action="<?php echo base_url('login/logar'); ?>" method="post">
<table>
    <tr class="preto negrito">
        <td>Email<br /><input type="text" name="login_email" id="login_email"></td>
        <td>Senha<br /><input type="password" name="login_senha" id="login_senha"></td>
        <td>&nbsp;<br /><input type="submit" value="Entrar" class="botao" id="acessar" /></td>
    </tr>
</table>
</form>